[article]
| Titre : |
Phenolic Resins |
| Type de document : |
texte imprimé |
| Auteurs : |
Clive H. Hare, Auteur |
| Année de publication : |
1996 |
| Article en page(s) : |
p. 41-46 |
| Langues : |
Anglais (eng) |
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Apart from plasticized nitrocellulose (celluloid), the phenolic resins are the oldest of the syntetics, dating to the early decades of this century. Their chemistry is based on the condensation of phenol and modified phenols, such as para-phenyl phenol, para-tertiary butyl phenol, bisphenol A, and cresol (Table 1), with an aldheyde-virtually always formaldehyde.
As a class, the phenolics are characterized by excellent adhesion properties and resistance to moisture and oxygen. They have excellent heat and chemical resistance and good electrical properties. The phenolic hydroxyl is a point of some vulnerability in the resins because it leads to slight alkali sensitivity. This sensitivity can generally be offset by modification with other resin systems. More limiting is the dark colour of many phenolic compositions. (The phenolic resoles are almost always darker than the novolacs). The color and tendency of the film to darken furtherwhen exposed preclude many exterior applications (especially in light colors).
The fundamental synthesis reaction of phenolic resins may proceed in 1 of 2 ways, depending upon the ratios of the 2 primary reactants and pH. |
| Note de contenu : |
- Phenolic Novolacs
- Phenolic Resoles
- Unmodified Resoles as Coating Vehicles
- Alcohol-Modified Resoles
- Phenolic Epoxies
- Phenolic-Modified Rosins
- Oil-Soluble Phenolics and their Varnishes
- Other Phenolic Hybrids
- Phenolic Dispersion Resins
|
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13480 |
in PAINTINDIA > Vol. XLVI, N° 4 (04/1996) . - p. 41-46
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Phenolic Resins in PAINTINDIA, Vol. XLVI, N° 4 (04/1996)
